Abstract
Additively colored crystals of KCl were cooled rapidly from a high temperature and then exposed to light absorbed by the F band. The rate of growth of the M band was initially low and increased markedly during the first part of the irradiation giving rise to what is called a “delay period” in the M center formation. During this delay period it was observed that 1. the quantum efficiency of F center fluorescence decreases by a factor of 3 or 4, and 2. the ability to convert F centers to F′ centers is reduced by about a factor of 3. These effects are interpreted as arising because of an appreciable decrease in the average nearest neighbor F center separation during this period.
Results are also presented concerning the kinetics of M center formation, oscillator strengths of the M center transitions, the degree of polarization of the M center fluorescence, and the transfer of energy from an excited F center to an M center.
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Based on work performed under the auspices of the U.S. Atomic Energy Commission.
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Delbecq, C.J. A study of M center formation in additively colored KCl. Z. Physik 171, 560–581 (1963). https://doi.org/10.1007/BF01377876
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DOI: https://doi.org/10.1007/BF01377876